September 2023 1 7 Report

175. Упростите выражение и найдите его значение:
1) 7,8a + 2,3а - 5а при а = 6;
2) 2(0,3b + 5) + 1,4b при b = 4;
3) 6(a + 1,5) – 2,8а при а = 1,5;
4) 4(b + 0,8) + 1,7b при b = 2,3.

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